Design Google Docs

1. Problem Statement

2. Architecture Discussion Map

Use this as one discussion aid, not a single correct answer. Your design should follow from the requirements, scale, and trade-offs you establish.

graph LR
    A["Design Google Docs"]
    A --> F1["Operational Transformation OT or CRDTs"]
    A --> F2["WebSocket / Long Polling"]
    A --> F3["Conflict Resolution"]
    A --> F4["Bandwidth Optimization"]
    A --> F5["Offline Support"]

3. Key Focus Areas

• 1
  Operational Transformation (OT) or CRDTs
• 2
  WebSocket / Long Polling
• 3
  Conflict Resolution
• 4
  Bandwidth Optimization
• 5
  Offline Support

4. What the Interviewer Looks For

The interviewer probes these areas, and the report grades the interview against them.

• Requirements and estimation
• Concurrency control and convergence
• Session architecture and sync protocol
• Persistence, snapshots, and history
• Offline editing, failure handling, and permissions